// ── CalDAV Sync ──

import { $, esc, api, getCsrf } from './util.js';

const CAL_ICONS = [
    { id: 'calendar-dots', label: 'calendar' },
    { id: 'briefcase', label: 'work' },
    { id: 'house', label: 'home' },
    { id: 'heart', label: 'personal' },
    { id: 'cake', label: 'birthday' },
    { id: 'graduation-cap', label: 'education' },
    { id: 'airplane', label: 'travel' },
    { id: 'basketball', label: 'sport' },
    { id: 'first-aid', label: 'health' },
    { id: 'star', label: 'important' },
    { id: 'users', label: 'team' },
    { id: 'phone', label: 'calls' },
];
const CAL_COLORS = ['#38bdf8', '#8b5cf6', '#fb7185', '#fbbf24', '#4ade80', '#fb923c', '#22d3ee', '#f472b6', '#a3e635', '#94a3b8'];

let calendarConfigs = {}; // slug → { color, icon }
const CAL_CONFIG_KEY = 'hyprcrd-cal-configs';

const settingsOverlay = $('settings-overlay');
const urlInput = $('caldav-url');
const userInput = $('caldav-user');
const passInput = $('caldav-pass');
const testStatus = $('caldav-test-status');
const syncStatus = $('caldav-sync-status');
const logEl = $('caldav-log');

export function openCaldavSettings() {
    // Open settings overlay on sync tab
    settingsOverlay?.classList.add('open');
    settingsOverlay?.querySelectorAll('.settings-tab').forEach(t => t.classList.toggle('active', t.dataset.tab === 'sync'));
    settingsOverlay?.querySelectorAll('[id^="settings-panel-"]').forEach(p => p.classList.toggle('hidden', p.id !== 'settings-panel-sync'));
    loadSettings();
}

export function closeCaldavSettings() {
    settingsOverlay?.classList.remove('open');
}

function loadCalConfigs() {
    try { calendarConfigs = JSON.parse(localStorage.getItem(CAL_CONFIG_KEY) || '{}'); } catch { calendarConfigs = {}; }
}
function saveCalConfigs() {
    localStorage.setItem(CAL_CONFIG_KEY, JSON.stringify(calendarConfigs));
}
export function getCalConfig(slug) {
    loadCalConfigs();
    return calendarConfigs[slug] || null;
}

export function getAllCalConfigs() {
    loadCalConfigs();
    return calendarConfigs;
}

function renderCalList(calendars) {
    const container = $('caldav-cal-list');
    const wrap = $('caldav-calendars');
    if (!container || !wrap || !calendars?.length) return;
    loadCalConfigs();
    wrap.classList.remove('hidden');
    container.innerHTML = calendars.map(cal => {
        const slug = cal.name.toLowerCase().replace(/[^a-z0-9_-]/g, '');
        const cfg = calendarConfigs[slug] || {};
        const activeColor = cfg.color || '#94a3b8';
        const activeIcon = cfg.icon || 'calendar-dots';
        return `<div class="flex items-center gap-2 py-1" data-cal-slug="${slug}">
            <span style="width:10px;height:10px;border-radius:2px;background:${activeColor};flex-shrink:0;"></span>
            <span class="font-pixel text-[10px] text-t-bright flex-1">${esc(cal.name)}</span>
            <div class="flex gap-1">
                ${CAL_COLORS.map(c => `<button class="cal-cfg-color" data-color="${c}" style="width:14px;height:14px;border-radius:2px;background:${c};border:2px solid ${c === activeColor ? 'var(--t-bright)' : 'transparent'};cursor:pointer;"></button>`).join('')}
            </div>
            <div class="flex gap-1 ml-1">
                ${CAL_ICONS.slice(0, 6).map(ic => `<button class="cal-cfg-icon" data-icon="${ic.id}" title="${ic.label}" style="font-size:12px;cursor:pointer;padding:1px;border-radius:2px;${ic.id === activeIcon ? 'color:var(--t-accent);' : 'color:var(--t-dim);'}"><i class="ph ph-${ic.id}"></i></button>`).join('')}
            </div>
        </div>`;
    }).join('');

    container.querySelectorAll('.cal-cfg-color').forEach(btn => {
        btn.addEventListener('click', () => {
            const slug = btn.closest('[data-cal-slug]').dataset.calSlug;
            if (!calendarConfigs[slug]) calendarConfigs[slug] = {};
            calendarConfigs[slug].color = btn.dataset.color;
            saveCalConfigs();
            renderCalList(calendars);
        });
    });
    container.querySelectorAll('.cal-cfg-icon').forEach(btn => {
        btn.addEventListener('click', () => {
            const slug = btn.closest('[data-cal-slug]').dataset.calSlug;
            if (!calendarConfigs[slug]) calendarConfigs[slug] = {};
            calendarConfigs[slug].icon = btn.dataset.icon;
            saveCalConfigs();
            renderCalList(calendars);
        });
    });
}

export async function loadSettings() {
    const s = await api('api/caldav/settings');
    if (!s) return;
    if (urlInput) urlInput.value = s.url || '';
    if (userInput) userInput.value = s.username || '';
    if (passInput) passInput.value = '';
    if (passInput && s.has_password) passInput.placeholder = '(saved)';
    if (syncStatus) syncStatus.textContent = s.last_sync ? `last sync: ${s.last_sync}` : '';
    // Load calendar list if configured
    if (s.url && s.has_password) {
        const test = await fetch('api/caldav/test', {
            method: 'POST', headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': getCsrf() },
            body: '{}',
        }).then(r => r.json()).catch(() => null);
        if (test?.calendars) renderCalList(test.calendars);
    }
}


$('caldav-test')?.addEventListener('click', async () => {
    testStatus.textContent = 'testing...';
    testStatus.style.color = 'var(--t-dim)';
    const body = { url: urlInput.value, username: userInput.value };
    if (passInput.value) body.password = passInput.value;
    const res = await fetch('api/caldav/test', {
        method: 'POST', headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': getCsrf() },
        body: JSON.stringify(body),
    }).then(r => r.json()).catch(() => ({ ok: false, error: 'network error' }));

    if (res.ok) {
        const names = (res.calendars || []).map(c => c.name).join(', ');
        testStatus.textContent = `connected (${names || 'no calendars'})`;
        testStatus.style.color = 'var(--t-accent)';
        if (res.calendars) renderCalList(res.calendars);
    } else {
        testStatus.textContent = res.error || 'failed';
        testStatus.style.color = 'var(--t-danger)';
    }
    showConnectionLog(res.log);
});

$('caldav-save')?.addEventListener('click', async () => {
    const body = { url: urlInput.value, username: userInput.value, enabled: true };
    if (passInput.value) body.password = passInput.value;
    await api('api/caldav/settings', { method: 'POST', body });
    testStatus.textContent = 'saved';
    testStatus.style.color = 'var(--t-accent)';
});

$('caldav-sync-now')?.addEventListener('click', () => triggerSync());
$('notes-reset')?.addEventListener('click', async () => {
    if (syncStatus) { syncStatus.textContent = 'resetting notes...'; syncStatus.style.color = 'var(--t-dim)'; }
    const res = await fetch('api/notes/reset', {
        method: 'POST', headers: { 'X-CSRF-Token': getCsrf() },
    }).then(r => r.json()).catch(() => null);
    if (res?.ok) {
        const s = res.stats || {};
        if (syncStatus) { syncStatus.textContent = `reset: ${res.reset || 0} cleared, ${s.pulled || 0} re-pulled`; syncStatus.style.color = 'var(--t-accent)'; }
        await window._reloadAll?.();
    } else {
        if (syncStatus) { syncStatus.textContent = res?.error || 'reset failed'; syncStatus.style.color = 'var(--t-danger)'; }
    }
});

export async function triggerSync() {
    const btn = $('cal-sync');
    if (btn) btn.style.opacity = '0.5';
    if (syncStatus) { syncStatus.textContent = 'syncing...'; syncStatus.style.color = 'var(--t-dim)'; }

    const res = await fetch('api/caldav/sync', {
        method: 'POST', headers: { 'X-CSRF-Token': getCsrf() },
    }).then(r => r.json()).catch(() => ({ ok: false, error: 'network error' }));

    if (btn) btn.style.opacity = '';

    // Also sync WebDAV Notes
    const notesRes = await fetch('api/notes/sync', {
        method: 'POST', headers: { 'X-CSRF-Token': getCsrf() },
    }).then(r => r.json()).catch(() => null);

    if (res.ok) {
        const s = res.stats || {};
        const ns = notesRes?.stats || {};
        const total = { pushed: (s.pushed || 0) + (ns.pushed || 0), pulled: (s.pulled || 0) + (ns.pulled || 0), deleted: (s.deleted || 0) + (ns.deleted || 0) };
        const allLog = [...(res.log || []), ...(notesRes?.log || [])];
        const hasErrors = allLog.some(l => l.status === 'error');
        const msg = `pushed:${total.pushed} pulled:${total.pulled} del:${total.deleted}${ns.pulled ? ' notes:' + ns.pulled : ''}`;
        if (syncStatus) { syncStatus.textContent = msg; syncStatus.style.color = hasErrors ? 'var(--t-danger)' : 'var(--t-accent)'; }
        await window._reloadAll?.();
        showLog(allLog);
        showSyncNotification(total);
    } else {
        if (syncStatus) { syncStatus.textContent = res.error || 'sync failed'; syncStatus.style.color = 'var(--t-danger)'; }
    }
}

function showLog(log) {
    if (!logEl || !log?.length) return;
    logEl.classList.remove('hidden');
    logEl.innerHTML = log.map(l =>
        `<div class="${l.status === 'error' ? 'text-t-danger' : 'text-t-dim'}">${l.dir} ${l.action} ${l.status}${l.detail ? ' — ' + l.detail : ''}</div>`
    ).join('');
}

function showConnectionLog(lines) {
    if (!logEl || !lines?.length) return;
    logEl.classList.remove('hidden');
    logEl.innerHTML = lines.map(l =>
        `<div class="${l.startsWith('ERROR') || l.startsWith('EXCEPTION') ? 'text-t-danger' : l.startsWith('OK') ? 'text-t-accent' : 'text-t-dim'}">${l.replace(/</g, '&lt;')}</div>`
    ).join('');
}

$('notes-rekey')?.addEventListener('click', async () => {
    const { showDialog } = await import('./dialog.js');
    const oldPass = await showDialog({ title: 're-key notes', input: 'password', placeholder: 'old password', okLabel: 're-key' });
    if (!oldPass) return;
    if (syncStatus) { syncStatus.textContent = 're-keying notes...'; syncStatus.style.color = 'var(--t-dim)'; }
    const res = await fetch('api/notes/rekey', {
        method: 'POST', headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': getCsrf() },
        body: JSON.stringify({ old_password: oldPass }),
    }).then(r => r.json()).catch(() => null);
    if (res?.ok) {
        if (syncStatus) { syncStatus.textContent = `re-keyed ${res.rekeyed} notes — syncing...`; syncStatus.style.color = 'var(--t-accent)'; }
        // Re-pull with correct key
        const pullRes = await fetch('api/notes/reset', { method: 'POST', headers: { 'X-CSRF-Token': getCsrf() } }).then(r => r.json()).catch(() => null);
        await window._reloadAll?.();
        if (syncStatus) syncStatus.textContent = `re-keyed ${res.rekeyed} notes, ${pullRes?.stats?.pulled || 0} re-pulled`;
    } else {
        if (syncStatus) { syncStatus.textContent = res?.error || 're-key failed'; syncStatus.style.color = 'var(--t-danger)'; }
    }
});
$('cal-caldav-settings')?.addEventListener('click', openCaldavSettings);
$('cal-sync')?.addEventListener('click', () => triggerSync());

// Auto-sync throttle
let lastAutoSync = 0;
export function autoSync() {
    const now = Date.now();
    if (now - lastAutoSync < 60000) return;
    lastAutoSync = now;
    triggerSync();
}

// Background sync every 2 minutes
function showSyncNotification(stats) {
    const s = stats || {};
    const parts = [];
    if (s.pulled) parts.push(`${s.pulled} received`);
    if (s.pushed) parts.push(`${s.pushed} sent`);
    if (s.deleted) parts.push(`${s.deleted} deleted`);
    if (!parts.length) return;

    const note = document.createElement('div');
    note.style.cssText = 'position:fixed;bottom:60px;right:16px;z-index:200;background:var(--t-surface);border:1px solid var(--t-accent);border-radius:4px;padding:10px 14px;box-shadow:0 4px 20px rgba(0,0,0,0.4);max-width:300px;';
    note.innerHTML = `<div style="font-family:var(--t-font-pixel);font-size:10px;color:var(--t-accent);display:flex;align-items:center;gap:6px;"><i class="ph ph-cloud-arrow-down"></i>CalDAV: ${parts.join(', ')}</div>`;
    document.body.appendChild(note);
    setTimeout(() => { note.style.transition = 'opacity 0.3s'; note.style.opacity = '0'; setTimeout(() => note.remove(), 350); }, 4000);
}

let bgSyncRunning = false;
async function backgroundSync() {
    if (bgSyncRunning) return;
    bgSyncRunning = true;
    try {
        const headers = { 'X-CSRF-Token': getCsrf() };
        const [res, notesRes] = await Promise.all([
            fetch('api/caldav/sync', { method: 'POST', headers }).then(r => r.ok ? r.json() : null).catch(() => null),
            fetch('api/notes/sync', { method: 'POST', headers }).then(r => r.ok ? r.json() : null).catch(() => null),
        ]);
        const s = res?.stats || {};
        const ns = notesRes?.stats || {};
        const total = { pushed: (s.pushed || 0) + (ns.pushed || 0), pulled: (s.pulled || 0) + (ns.pulled || 0), deleted: (s.deleted || 0) + (ns.deleted || 0) };
        if (total.pulled > 0 || total.pushed > 0 || total.deleted > 0) {
            await window._reloadAll?.();
            showSyncNotification(total);
        }
    } catch {} finally {
        bgSyncRunning = false;
    }
}

// Start background sync after app is ready
let bgSyncInterval = null;
export function startBackgroundSync() {
    if (bgSyncInterval) return;
    backgroundSync();
    bgSyncInterval = setInterval(backgroundSync, 45000); // every 45 seconds
}